The power to
use incredibly dense muscle as armor
. Combination of
Muscle Mass Enhancement
. Not to be confused with
Tekkai (One Piece)
The user's muscles are so dense and bulky, that that they can use it to cause physical attacks to bounce off of their muscles. Since the muscles are directly under one's skin, the bulk can be used to protect one's bones and innards. By bulking the muscles at point of contact, the user can even bounce the attack back.
Areas with less muscle concentration may be less protected.
Areas with no muscle concentration are not protected.
Does not protect the outer skin, so scratches and flays on that is still possible.
If attacks gets into body, then muscles cannot protect.
May require user to consciously bulk up muscles to block attacks.
Muscles are still part of one's flesh body, and are vulnerable to damages not of pure brute force (burning, freezing and electrifying).
Gyanza Rujike (Black Cat) using his enhanced muscles to cause bullets to bounce off.
The Hulk's (Marvel Comics) muscles are so bulky and dense that conventional bullets simply bounce off.
Blueno (One Piece) using
Tekkai to harden his body, causing Tilestone's hammer to shatter upon recoil impact.
Rob Lucci (One Piece) using
Tekkai: Utsugi to bulk his muscles at the time of impact, causing the attack to be bounced back.
Hody Jones (One Piece) took so much
Energy Steroids that his muscles bulked up to the point of being bulletproof.
Conkeldurr (Pokémon) using
Bulk Up to up its muscles, increasing offense and defense.
Metapod (Pokémon) using
Harden to stiffen all the muscles in its body, increasing its defense.
Zangief's (Street Fighter) muscles are so bulky that they can not only stop a katana, but break it to no ill effect.
Ultimate Kevin (Ben 10: Ultimate Alien) possesses Humungousar, Ultimate Humungosaur, Four Arms and Ultimate Aggeregor's durability.